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Communication Theory

Communication Theory. Modulation and Channels. Communication System. Today’s lecture: focus on dashed boxes. BFSK Modulator. Choose between two frequencies. BPSK Demodulator. Mix input with coherent reference. BPSK Modulator. Choose between two phases. BPSK Demodulator.

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Communication Theory

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  1. Communication Theory Modulation and Channels Modulation and Channels

  2. Communication System • Today’s lecture: focus on dashed boxes Modulation and Channels

  3. BFSK Modulator • Choose between two frequencies Modulation and Channels

  4. BPSK Demodulator • Mix input with coherent reference Modulation and Channels

  5. BPSK Modulator • Choose between two phases Modulation and Channels

  6. BPSK Demodulator • Mix input with coherent reference Modulation and Channels

  7. QPSK Modulator • Transmit one of 4 symbols • In-phase and quadrature components Modulation and Channels

  8. QPSK Demodulator • Evaluate in-phase and quadrature components seperately using coherent reference Modulation and Channels

  9. OQPSK Modulator • Reduce intensity of phase change in QPSK Modulation and Channels

  10. MSK Modulator • Do away with sharp changes in phase Modulation and Channels

  11. Pulse Shapes • Combat ISI by replacing square pulses with smoother ones Modulation and Channels

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